bevyengine/bevy · warning · AsBindGroupError

RetryNextUpdate

RetryNextUpdate

Error message

The bind group could not be generated

What it means

AsBindGroupError::RetryNextUpdate is the documented 'not ready yet' signal from AsBindGroup::as_bind_group: a dependency (typically an image/texture asset) is not yet loaded or prepared, and the caller should try again on a later frame (bind_group.rs doc, line ~107). Bevy's material preparation treats it as transient - the material is re-queued and retried next update instead of failing fatally.

Source

Thrown at crates/bevy_render/src/render_resource/bind_group.rs:642

    /// be used. `ExtendedMaterial` uses this in order to ensure that the base
    /// material doesn't use bindless mode if the extension doesn't.
    fn bind_group_layout_entries(
        render_device: &RenderDevice,
        force_no_bindless: bool,
    ) -> Vec<BindGroupLayoutEntry>
    where
        Self: Sized;

    fn bindless_descriptor() -> Option<BindlessDescriptor> {
        None
    }
}

/// An error that occurs during [`AsBindGroup::as_bind_group`] calls.
#[derive(Debug, Error)]
pub enum AsBindGroupError {
    /// The bind group could not be generated. Try again next frame.
    #[error("The bind group could not be generated")]
    RetryNextUpdate,
    #[error("Create the bind group via `as_bind_group()` instead")]
    CreateBindGroupDirectly,
    #[error("At binding index {0}, the provided image sampler `{1}` does not match the required sampler type(s) `{2}`.")]
    InvalidSamplerType(u32, String, String),
}

/// A prepared bind group returned as a result of [`AsBindGroup::as_bind_group`].
pub struct PreparedBindGroup {
    pub bindings: BindingResources,
    pub bind_group: BindGroup,
}

impl PreparedBindGroup {
    pub(crate) fn unprepare(&self) -> BindGroupBuilder {
        let mut data_buffer = vec![];
        BindGroupBuilder {
            binding_resources: UnpreparedBindingResources(

View on GitHub (pinned to 396ca72708)

Solutions

1. No action needed in normal flows - the engine retries automatically; a few of these during initial asset load are expected.
2. If it persists indefinitely, check that the referenced asset path/handle actually loads (look for AssetServer load errors) and the asset's RenderAssetPlugin is registered.
3. In custom code calling as_bind_group, match this variant and defer to the next frame instead of aborting.

Example fix

// before
let prepared = material.as_bind_group(&layout, render_device, render_queue, &mut param)?;

// after
match material.as_bind_group(&layout, render_device, render_queue, &mut param) {
    Ok(prepared) => { /* use prepared.bind_group */ }
    Err(AsBindGroupError::RetryNextUpdate) => { /* asset not ready; try again next frame */ }
    Err(e) => error!("bind group failed: {e}"),
}

// If you can cheaply check the dependency before calling:
if gpu_images.contains(image_handle.id()) {
    let prepared = material.as_bind_group(&layout, device, queue, &mut param)?;
}

match material.as_bind_group(&layout, render_device, render_queue, &mut param) {
    Ok(prepared) => { /* bind */ }
    Err(AsBindGroupError::RetryNextUpdate) => {
        // dependency not ready; re-queue and try again next frame
    }
    Err(e) => error!("bind group error: {e}"),
}

When it happens

Trigger: A material's bind group references an asset that has not finished loading/preparing (image still decoding, GPU resource not yet created); as_bind_group returns RetryNextUpdate and material preparation (material_bind_groups.rs:2817) converts it into PrepareAssetError::RetryNextUpdate, keeping the material queued.

Common situations: Materials with file-loaded textures during the first frames after startup; switching a material's texture handle to a newly-created asset at runtime; slow asset IO; an asset whose loader path or server configuration is broken (then the retry never succeeds).

Related errors

• Failed to build bind group: {0}
• CreateBindGroupDirectly
• RenderPipelineDescriptor has no FragmentState configured
• Failed to prepare atmosphere bind groups. Light uniform buff
• sampler attribute must have matching texture attribute

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/ca53135a1c124707. Report an issue: GitHub.